Expansion dowel



F. NETTLETON 2,654,297

EXPANSION DOWEL Oct. 6,1953.

Filed Feb. 18, 1949 INVENTOR FELIX L. NETTLETON AQM 7 M ATTORNEYS,

Patented Oct. 6, 193? UNITED STATES PATENT oFncE EXPANSION DOWEL Felix L. Nettleton, Kingston, N. Y. Application February 18, 1949, Serial No. 77,225

Claims.

This invention relates to dowels for concrete expansion joints and is primarily intended for reinforcing and maintaining the alinement of the longitudinal joints in multi-lane highway pavements, although it is adaptable to all forms of concrete construction wherein natural expansion and contraction occurs.

In concrete road construction a longitudinal joint is provided to separate the pavement into parallel lanes where the width of the road makes this desirable in order to take care of transverse expansion and contraction due to changes in temperature or other causes. Such joints as heretofore used gradually widen due to shifting of the pavement on each side to a degree that is dangerous to high speed traffic and detrimental to the road bed. My invention aims to overcome this difiiculty.

Further aims and objects of the invention are to maintain the horizontal alinement of the abutting edges of the pavement by preventing vertical movement of either edge independently of the other and to provide a simple and cheap form of dowel that can be installed easily as the pavement is laid.

With these purposes in view I have devised a form of dowel having only three separate parts, as illustrated in the accompanying drawings, wherein Figs. 1 and 2 are a plan view and a side view, respectively, of the assembled dowel; Figs. 3 and 4 are plan views of the male and female members, respectively, the socket portion of the female member being shown in section. Fig. 5 is a side view of the locking pin; Fig. 6 is a cross section of the assembled dowel taken on the line AA in Fig. 1, looking in the direction of the arrows, and showing the locking pin in edge elevation; and Fig. 7 is a vertical cross section of a partly finished pavement, showing the dowel parts in position with the steel form after pouring the first section of concrete, the locking pin and joint packing as they appear in the finished pavement being shown in dot and dash lines.

In the dowel illustrated there are two bifurcated anchor members III, II adapted to be embedded in the concrete, one on each side of the joint, and connected by a pin I2 which passes through slits I3 in the top and bottom walls of a tubular socket I4 welded to one of the anchor members and through a loop I5 formed between the two branches of the other anchor member. Each anchor member is preferably formed from rod or bar stock, doubled and bent to the shapes shown in Figs. 3 and 4, to provide diverging branches with terminal hooks or flanges I6.

The male anchor member I0 (see Fig. 3) has a spacing collar I 'I' welded to its loop end I5 where the branches diverge and spaced from the loop end far enough to permit the desired overlap between this end and the socket I4 of the female anchor member I I in working position of the two members.

The female anchor member II (see Fig. 4) has a short loop portion I8 which is welded within one end of the socket I4 so as to aline with the loop I5 of the male anchor member when the parts are in working position. The slits I3 in the top and bottom walls of the socket may be punched prior to forming the socket if the latter is made out of flat steel plate, or cut or punched either before or after the flattening operation if the socket is made out of steel tubing.

The T-shaped locking pin I2 is advantageously stamped from sheet steel but may be forged or cast as preferred. This locking pin is preferably shaped to engage in the slits I3 in the top and bottom walls of the socket I4 as shown in Figs. 1 and 2, its width being sufiiciently less than the length of the loop I 5 to permit some play lengthwise of the loop I5 in the socket l4 when the parts are permanently assembled and embedded in the finished slab as hereinafter described. One of the branches I9 of the T is longer than the other for providing a slight adjustability of the female anchor member towards and away from the expansion joint in setting it in the concrete. The lower end of the narrow stem is cut at an angle to adapt it for retaining the male member in place during the pouring of the first section of concrete.

The three parts of the dowel are readily fabricated and assembled for use, and may be placed in position and embedded in the concrete by unskilled labor. In constructing a road pavement for example, illustrated in Fig. 7, the male an hor member II] is supported by the form 2| with its loop end I5 projecting throu h a suitable opening in the form and its co lar I'I against the inside face of the form, being held in position by the pin I2 which is placed sidewise in the projecting loop I5 with its long head against the web of the form and its narrow end wed ed a ainst the end of the loop I5. After the first section 20 is poured and the anchor member In is firmly embedded therein, the pin I2 is withdrawn and the form 2I is removed, whereupon one or more sheets of tarred felt or layers of mastic, cork or rubber or other joint packing 22 are placed against the edge of the section 20' of pavement as is usual in such expansion joints, and the loop pin engages against the outer face of the packing 22 (indicated by the dot and dash lines Fig. 7) to secure it in place if only a slighteggpansion of the joint is desirable, and if more-expari sion is allowable the shorter branch of the, 11:.

head is placed in engagement withtliepacliing,"

thus positioning the pin I2 limited thereby to the extent desired.

l fi E'Q FQ I la s, ?9 by transverse 'ex'p ansion joints the ointifilling may be 'sedtd support'thedowels'dl gt i je u mant as ier i e. met t i i i h m iq ari her by. i itin i he mus n .1 proceed withoutinterruption.

The"invention is applicable to both longitudinal and transverse joints in aa i esaiaajm maintain 5 the alinement of the slabs with flush sir aces as well as to control the amount of contractidnfan d the widening ofthe joint, thus be} irig' adapted to roads side walks; curbs and guttergiwalls. pipe; and other structures embody; in: largeblocks of concrete construction joints er w aks r je1 r n s" "'Theiinventionis notre's trict'e'd to the particu: lar shapes" and' sizes' of the dowelelenients; as ob i i ameexmme were it i R m striictuie'in which the joint'is' formed.

Wha-t I claim and. desire to se ues; by Letters Paten't'is a 'rduowsz" Z thr e part dowel for controlling the exjoints iri coricrete js'truci c 175; anchor i "members H M middlto'provi de elon diloopsi the]: nds or aid diverging tel itute anchor elements, a socket; integrally on the endlofjthe loop portionlof ons member-and adapted to receive'the loop ras hd memb i ara ransversely elongated openings its P7 receive'a locking'pinfiajid a p r n'g througHsaid'open nameless the sides dithe" loop portion" 'id seco nd anchor member preventing with? drawal thereof from said socket and permitting pansion of; construction plpr siee) ir ed of rods bent at th x9 i hem se mswemeeie feq i a socket.,'

2"'.- The A combination as s t forth in claim 1 wherein saidfother anchor member is provided wit an inte'gr l spacingfcollar'adjacent theinner n i 91 s. 1 01 rti n- 3T-The combination as set forth in claim-2; laterally extend h enth l t n has a 111% h ad. p e l e n a i e i mn 9 et}? e i ea e sai eema q lfie with respect tc th loop where the expansion of the joint wi ll be 4. A limited movement joint assembly for connecting adjacent-concrete slabs comprising interengaged male and female anchor members embedded in said slabs one on each side of their juncture, said male anchor member projecting across said juncture and said female anchor memher having a tubular extension slidably fitting the projecting end of the male anchor member, a locking pin having a stem passing through aliningiqpenings. in said tulaularfextension and in an P oje tin en e-flami n. ai male anchor member being longer than the width of said locking pin providing limited capacity for movement of said male anchor member with resp ct to said locking pin while preventing withn l hr i h al ne. finines i a d a ho j mr fijs openi e. n. ai al n hor. embe beingei n at hi h m th d o s s s, o iii r e ma e pr ember n a ri ratei ma inal r hits nchor nd M ide. nerdf cw' rd he la qbepo re wa ts pin. pen n s h n os i i de O he. orm m",

' l ee ri a' s m le. n o member n P 7 i formi nrin fih eeri sa dl slab by said pin arranged transversely in said ne iee nth se d fl tw n .wnieqt i di i hereafter movi g a d e. si qr and positioning the female anchor rriember with il i s m@1' m iW-i h h peni ei h lembda member ecu inethew n hq mb r t e er ylm eri ie ai P n. hro h said alined openings with its stem parallel to the dee f n i aced r la iq t sa st P iab; aridipburi a aid s eqnds abole ab d aid udl femaleaai l pr. mbn

FELIX i. ETELETQNx References-Cited the file of this patentc N T D STAT aws-rs 

